I wouldn't go as far as to call shagging crude, but it doesn't convey the sense of importance that some women and less frequently men seem to associate with it.
It really doesn't matter what you call it, it doesn't change what you do. I'm sure some people are still under the delusion that it is some kind of holy act. It's just sex, get real. It's something fun to share with someone close or something still fun to share with whoever you like, if you don't have someone close.